Fortify Series
Miami-Dade NOA
Florida DBPR
Approved
Design Pressure +50/-70 psf
NFRC Certified
Made in Florida
CWS Fortify 310 Aluminum Single Hung (Fin Frame)
CWS's coastal-rated aluminum non-impact line, engineered for high design pressures.
Masonry/block-opening replacement variant of the Fortify aluminum non-impact single-hung. Sized for retrofit into existing concrete or block walls.
Miami-Dade NOA
Florida DBPR
Approved
Design Pressure +50/-70 psf
NFRC Certified
Made in Florida
Custom Window Systems
Product photography coming soon
Frame finish
White
Bronze
Custom
Built for South Florida homes
The CWS-310 Fin is the masonry/block-opening (replacement) frame variant of the Fortify aluminum non-impact single-hung window, sized for retrofit installations into existing concrete or block walls common across Florida residential construction.
- Florida Building Code product-approved
- Aluminum frame engineered for strength and durability
- Energy-efficient Low-E insulated glass options to control heat gain
- Corrosion-resistant finishes for coastal applications
- Professionally installed across South Florida by Armor Pro
Configurations
X = operable panel (it opens) · O = fixed panel (doesn’t open). Panels read left‑to‑right as viewed from outside (hung windows read top‑to‑bottom). Example: XO = operable on the left, fixed on the right.
Grille Patterns
Grille Styles
Flat 5/8" (Grilles-Between-the-Glass)Raised Pyramid 1-1/8" with Flat 1-1/8" (Exterior Applied + GBG)
Engineered Strength
Built and tested to Florida product-approval standards
Energy Efficient
Low-E insulated glass options reduce heat gain
Corrosion Resistant
Coastal-grade finishes for salt-air durability
Limited Warranty
Manufacturer warranty plus Armor Pro install workmanship
At a Glance
Frame Material
Aluminum
Max Size
53.125 x 74.25 in
Design Pressure
+50/-70 psf
U-Factor
1.12
SHGC
0.29–0.73
Visible Trans.
0.07–0.75
Sizes & Pressures
| Configuration | Min size | Max size | Design pressure |
|---|---|---|---|
| Single Hung (Fin) | 11 x 25 in | 53.125 x 74.25 in | +50/-70 psf |
Sizes shown are actual DLO frame size.
Glass & Energy Performance
| Glass package | U-Factor | SHGC | VT | CR |
|---|---|---|---|---|
| Blue | 1.12 | 0.477 | 0.603 | 12 |
| Bronze | 1.12 | 0.42 | 0.267 | 12 |
| Clear | 1.12 | 0.715 | 0.745 | 12 |
| Green | 1.12 | 0.53 | 0.64 | 12 |
| Gray | 1.12 | 0.375 | 0.175 | 12 |
U-Factor / SHGC shown without grids; add-grid values vary slightly. Confirm exact ratings for your opening at quote.
Performance Certifications
- 24-0116.15
- FL46524.R2
Options
Related Products
More models in the Fortify Series.
CWS Fortify 310 Aluminum Single Hung (Flange Frame)
Single Hung
See price & specs
CWS Fortify 320 Aluminum Horizontal Slider (Fin Frame)
Horizontal Roller
See price & specs
CWS Fortify 320 Aluminum Horizontal Slider (Flange Frame)
Horizontal Roller
See price & specs
CWS Fortify 330 Aluminum Fixed (Picture)
Fixed Window
See price & specs
Ready to install the CWS Fortify 310 Aluminum Single Hung (Fin Frame)?
Armor Pro measures, permits, and installs it across South Florida — code-compliant and warrantied. Get a free, no-obligation estimate.
Comparable from Other Brands
Other single hung models Armor Pro installs.
Frequently Asked Questions
The Fortify 310 Fin is the masonry/block-opening replacement variant of CWS's aluminum non-impact single-hung window, sized for retrofit into existing concrete or block walls common across Florida. The fin frame is the version we use when we're replacing a window in an existing block opening rather than building new. If your project is new construction, the matching choice is the Fortify 310 Flange (nail-fin) frame instead.
The Fortify 310 Fin builds from a minimum of 11 by 25 inches up to a maximum of 53.125 by 74.25 inches, so it covers small openings up through tall single-hung sizes. Single-hungs are typically taller than they are wide, which fits that envelope. We measure your existing block opening and confirm the buildable size with CWS before ordering.
The 310 Fin is rated to a design pressure of +50/-70 psf, which is the wind load it is engineered to withstand and the high-DP performance the aluminum Fortify line is built for. That coastal pressure rating is the main reason to choose aluminum non-impact over a lighter window. We confirm the exact rating for your size and opening at quote.
No, the 310 Fin is a non-impact aluminum single-hung and is not approved for the High Velocity Hurricane Zone in Miami-Dade or Broward. It is a high design-pressure window for coastal openings outside the HVHZ, or where shutters carry the opening protection. If you need an impact-rated single-hung, we install CWS's Hurricane Guard single-hungs instead and will confirm the right product for your address at quote.
The 310 Fin offers White (standard) or Bronze frames, and glass options including Low-E 270 (standard), Low-E 366, obscure Low-E insulating glass with argon, tempered, bronze-tinted, and gray-tinted. Grille choices are broad: flat 5/8-inch grilles-between-the-glass, raised pyramid with applied bars, 6-Lite and 9-Lite Prairie, Traditional, and Custom. Hardware comes in sweep lock or latch lock with spring in several colors, and we'll help you match the look to your home at quote.
Yes, the 310 Fin is built specifically for retrofit into existing concrete or block openings, which is exactly the situation in most older Florida block homes. Installed price depends on the size, glass package, grille pattern, and the condition of the existing opening, so we don't quote a flat number. Armor Pro provides a free, no-obligation estimate after measuring your openings.
No. Fortify is aluminum non-impact, engineered for coastal addresses that need high design-pressure performance and corrosion resistance but where the code does not actually require impact glass. It is the step between Comfort Shield vinyl non-impact and the impact Hurricane Guard line. If your opening must carry impact glazing on its own, we'd move you to Hurricane Guard instead.
Only in a limited way. The 380 sliding glass door is HVHZ-eligible when it is paired with hurricane shutters, which satisfy the opening-protection requirement in place of impact glass. The Fortify windows are not HVHZ products. So in Miami-Dade or Broward, Fortify only works on a shuttered door application, and we confirm that path before specifying it.
CWS (Custom Window Systems) is a Florida manufacturer founded in 1986 and headquartered in Ocala, with additional plants in Miami, Medley, and Jacksonville totaling more than 700,000 square feet. Because the line is engineered and built in Florida around the state's hurricane code, the products are designed for our climate rather than adapted to it. We install and service CWS products throughout South Florida.